Advances and new directions in gas-sensing devices

Electrochemical Sensors for Monitoring of Indoor and Outdoor Air Pollution

“…Zirconium oxide doped with yttrium oxide is thus used as an "oxygen pump" transporting the gas from one face of the sensing layer to the other. The current intensity thus generated is a measure of the amount of oxygen transported through the layer [6].…”

Electrochemical deposition of gold on indium zirconate (InZrOx with In/Zr atomic ratio 1.0) for high temperature automobile exhaust gas sensors

“…Owing to the exponential dependence of chemoresistive sensors on temperature, the sensitivity to temperature variations presents a major challenge for these sensors, as described by Kim et al [1] and therefore high performance temperature control of the sensor is important. In a recent critical review of the chemoresistive gas sensors, Sadek et al [13] believe that dependence of sensor response on operating temperature originates from varying adsorption and desorption kinetics for oxygen ions on the oxide surfaces.…”

“…The electronic gas sensors have found numerous applications in the past few decades including detection of hazardous combustible gases, industrial process and quality control, biomedical diagnostics, as well as monitoring automobile exhaust emissions [1]. Among these applications, detection of automobile exhaust gases specifically requires robust solid-state sensing devices that are stable and capable of withstanding harsh conditions such as temperature in the range of 500-600 °C [2][3][4][5].…”

“…This change in resistance in response to varying gas concentration is dependent on the partial pressure of surrounding oxygen in the gas phase and operating temperature [1,3], as given below:…”

Combustion synthesis of LaFeO3 sensing nanomaterial

“…The aim of this work is to synthesize LaFeO 3 by the citrate-nitrate auto-combustion method in order to obtain powder of pure single-phase with nanostructured crystallites and high specific surface area [18][19][20][21]. The sensor performance improvement, such as higher sensitivity, lower detection limit, lower operating temperature and faster response, can be obtained thanks to the usage of nano-dimensional materials, because of the large specific surface areas, which increases the interaction between the sensor surface and the surrounding gases, the high porosity, which allows the gas target penetration inside the sensing layer, and the useful thickness of the depletion layer, which promote the detection of small resistance changes [22]. 3 were prepared in order to study the influence of fuel-to-oxidizer ratio on the obtained powders.…”